Although no specific timeframe was detailed, Motorola's Punit Soni late yesterday shared that Android 4.4 KitKat will definitely be coming to the Droid Mini, Droid Ultra, Droid Maxx and the Moto X. He noted this on his Google+ page. Here's a quote,
We will keep you guys updated when a more concrete timetable is revealed. For now you can hit up the Motorola link below (or the link in the quote above) to get more info directly to your inbox.Do check out our Upgrade page for news on our plans here. We will keep updating it as things firm up across our devices.
Source: Google+ - Punit Soni & Motorola